diff --git a/synth.c b/synth.c
new file mode 100644
index 0000000..d2e6dd4
--- /dev/null
+++ b/synth.c
@@ -0,0 +1,141 @@
+/*
+ *  espeakup - interface which allows speakup to use espeak
+ *
+ *  Copyright (C) 2008 William Hubbs
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>
+
+#include "espeakup.h"
+
+/* multipliers and offsets */
+const int frequencyMultiplier = 11;
+const int pitchMultiplier = 11;
+int rateMultiplier = 34;
+int rateOffset = 84;
+const int volumeMultiplier = 22;
+
+espeak_ERROR set_frequency(struct synth_t *s, int freq, enum adjust_t adj)
+{
+	espeak_ERROR rc;
+
+	if (adj == ADJ_DEC)
+		freq = -freq;
+	if (adj != ADJ_SET)
+		freq += s->frequency;
+	rc = espeak_SetParameter(espeakRANGE, freq * frequencyMultiplier, 0);
+	if (rc == EE_OK)
+		s->frequency = freq;
+	return rc;
+}
+
+espeak_ERROR set_pitch(struct synth_t * s, int pitch, enum adjust_t adj)
+{
+	espeak_ERROR rc;
+
+	if (adj == ADJ_DEC)
+		pitch = -pitch;
+	if (adj != ADJ_SET)
+		pitch += s->pitch;
+	rc = espeak_SetParameter(espeakPITCH, pitch * pitchMultiplier, 0);
+	if (rc == EE_OK)
+		s->pitch = pitch;
+	return rc;
+}
+
+espeak_ERROR set_range(struct synth_t * s, int range, enum adjust_t adj)
+{
+	espeak_ERROR rc;
+
+	if (adj == ADJ_DEC)
+		range = -range;
+	if (adj != ADJ_SET)
+		range += s->range;
+	rc = espeak_SetParameter(espeakRANGE, range, 0);
+	if (rc == EE_OK)
+		s->range = range;
+	return rc;
+}
+
+espeak_ERROR set_punctuation(struct synth_t * s, int punct,
+							 enum adjust_t adj)
+{
+	espeak_ERROR rc;
+
+	if (adj == ADJ_DEC)
+		punct = -punct;
+	if (adj != ADJ_SET)
+		punct += s->punct;
+	rc = espeak_SetParameter(espeakPUNCTUATION, punct, 0);
+	if (rc == EE_OK)
+		s->punct = punct;
+	return rc;
+}
+
+espeak_ERROR set_rate(struct synth_t * s, int rate, enum adjust_t adj)
+{
+	espeak_ERROR rc;
+
+	if (adj == ADJ_DEC)
+		rate = -rate;
+	if (adj != ADJ_SET)
+		rate += s->rate;
+	rc = espeak_SetParameter(espeakRATE,
+							 rate * rateMultiplier + rateOffset, 0);
+	if (rc == EE_OK)
+		s->rate = rate;
+	return rc;
+}
+
+espeak_ERROR set_voice(struct synth_t * s, char *voice)
+{
+	espeak_ERROR rc;
+
+	rc = espeak_SetVoiceByName(voice);
+	if (rc == EE_OK)
+		strcpy(s->voice, voice);
+	return rc;
+}
+
+espeak_ERROR set_volume(struct synth_t * s, int vol, enum adjust_t adj)
+{
+	espeak_ERROR rc;
+
+	if (adj == ADJ_DEC)
+		vol = -vol;
+	if (adj != ADJ_SET)
+		vol += s->volume;
+	rc = espeak_SetParameter(espeakVOLUME, (vol + 1) * volumeMultiplier,
+							 0);
+	if (rc == EE_OK)
+		s->volume = vol;
+
+	return rc;
+}
+
+espeak_ERROR stop_speech(void)
+{
+	return (espeak_Cancel());
+}
+
+espeak_ERROR speak_text(struct synth_t * s)
+{
+	espeak_ERROR rc;
+
+	rc = espeak_Synth(s->buf, s->len + 1, 0, POS_CHARACTER, 0, 0, NULL,
+					  NULL);
+	return rc;
+}